code: def __len__(self) -> int:
      return max(len(self.corpus) // self.batch_size, 1)
  
imports: from abc import ABC
  from typing import Iterable, Iterator, TYPE_CHECKING
  from typing import List, Any, Tuple
  import numpy
  import tensorflow
label_desc: Use image node_id 2 for calling the Seq2SeqDataSet obj's underlying member method code with example usage: obj.__len__() and returns: max